package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

@Service
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private DishFavorMapper dishFlavorMapper;

    @Autowired
    private SetmealDishMapper setmealDishMapper;

    @Autowired
    private DishFavorMapper dishFavorMapper;
    /**
     * 插入菜品
     * @param dishDTO
     * @return
     */
    @Override
    public void addDish(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);

        dishMapper.insert(dish);
        // 获取insert语句生成的dishID
        Long dishId = dish.getId();

        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors !=null && flavors.size() >0){
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishId);
            });
            // 向口味表中插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /**
     * 菜品分页
     * @param dishPageQueryDTO
     * @return
     */
    @Override
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());
        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);
        long total = page.getTotal();
        return new PageResult(total, page.getResult());
    }

    /**
     * 菜品删除
     * @param ids
     */
    @Override
    @Transactional
    public void deleteDish(List<Long> ids) {
        // 判断菜品是否起售，起售菜品无法删除
        for (Long id: ids){
            Dish dish = dishMapper.getById(id);
            if (dish.getStatus() == StatusConstant.ENABLE){
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }
        // 判断菜品是否关联，被套餐关联菜品无法删除
        List<Long> setmealIds = setmealDishMapper.getSetmealIDsByDishIds(ids);
        if (setmealIds != null && setmealIds.size() > 0){
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }
        // 删除菜品
        for (Long id: ids){
            dishMapper.deleteById(id);
            // 删除菜品关联的口味数据
            dishFavorMapper.deleteByDishId(id);
        }

    }

    @Override
    public DishVO getById(Long id) {
        Dish dish = dishMapper.getById(id);
        List<DishFlavor> dishFlavors = dishFavorMapper.getsById(id);
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish, dishVO);
        dishVO.setFlavors(dishFlavors);
        return dishVO;
    }

    @Override
    public void updateWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);

        dishMapper.update(dish);

        // 先删除，再插入
        dishFavorMapper.deleteByDishId(dish.getId());

        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors !=null && flavors.size() >0){
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dish.getId());
            });
            // 向口味表中插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }


    }

    /**
     * 菜品状态改变
     * @param status
     * @param id
     */
    @Override
    public void changeStatus(Integer status, Long id) {
        Dish dish = dishMapper.getById(id);
        dish.setStatus(status);
        dishMapper.update(dish);
    }

    /**
     * 通过分类id获取菜品
     * @param categoryId
     * @return
     */
    @Override
    public List<Dish> getDishesByCategoryId(Long categoryId) {
        Dish dish = Dish.builder()
                .categoryId(categoryId)
                .status(StatusConstant.ENABLE)
                .build();

        return dishMapper.list(dish);

    }

    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getsById(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }
}
